The entire NATO approach of waiting to see whether or not Russia will make a move is stupid, as it allows Russia to keep the tactical initiative. It means Russia can relax knowing it can take as long as it wants to decide either way, while we have to remain tense at every moment anticipating a move. Russia is already winning, and the longer Russia keeps us waiting in this way, the more it wins.
If I were in charge, once we have enough troops ready, I would threaten to take back Crimea. This at least puts Russia in the same psychological condition ("Will they really invade?") as we are currently in, and hence puts the two sides back on equal footing.